ALBANY – A prominent Albany banker dirty-danced, kissed and fondled his married mistress at a dinner party while his estranged wife sat in jail on charges of having sex with an underage student, the woman’s aggrieved husband charged yesterday.

“He’s got four children and his own wife was having a traumatic experience,” David Bean said of Thomas Geisel, president of Key Bank Community Bank’s northeast region.

“Why did he have to go after my wife?” the alternately distraught and angry jilted husband added.

The Post reported yesterday that Geisel was named as the other man in a divorce proceeding filed in Albany state Supreme Court by Bean against his estranged wife, Karen Bean.

After his estranged wife denied to The Post having an affair, Bean spoke out for the first time yesterday, providing letters and e-mails he said he personally sent to Geisel asking that he back off from pursing Karen Bean as he attempted reconciliation with his wife of 14 years.

In one of the letters, dated Oct. 26, Bean takes Geisel to task for putting on a lusty public display of affection with Karen Bean at a dinner party while his former Catholic-school teacher wife, Sandra “Beth” Geisel, was in jail on sex charges.

Bean said he was told of the incident by a Key Bank customer who was “repulsed” and “disgusted” by the couple’s canoodling.

“He went on to say he couldn’t believe you, a bank president, would act like that with a married woman, while your wife sits in jail, in part, due to your adulterous history, which is well known in this community,” Bean wrote to Geisel.

In another letter, he wrote, “As you know I know all about your adulterous affair with my wife of 14 years, Karen Bean . . . what you don’t know is that I am still deeply in love with my wife I have been and will continue to make every effort possible to maintain a relationship with Karen.

“I urge you to break off this relationship with Karen Bean NOW.”

In court papers, Bean said the affair between Geisel and his wife began in May, about the same time law-enforcement officials say Sandra “Beth” Geisel began bedding at least three of her students, including a 16-year-old.

“The timing is suspicious to everyone I’ve spoken to,” Bean said.

Geisel could not be reached for comment yesterday.

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‘You are a predator. Taking advantage of a vulnerable and emotional married woman.’ – October 26, 2005 letter DavidBean wrote to the husband of Sandra Geisel (right)